Files
blog.pyaqa.ru/app/infrastructure/di/transaction_manager.py
Sergey Vanyushkin 87b094220d refactor: migrate to DDD architecture with Dishka DI
Complete architectural refactoring from simple MVC to Clean Architecture/DDD pattern:

Domain Layer:

- Add entities (Post, BaseEntity) with business logic

- Add value objects (Title, Content, Slug) with validation

- Add repository interfaces (PostRepository)

- Add domain exceptions

Application Layer:

- Add use cases (CreatePost, GetPost, UpdatePost, DeletePost, ListPosts, PublishPost)

- Add DTOs for data transfer

- Add TransactionManager interface

Infrastructure Layer:

- Add SQLAlchemy models and async database connection

- Add SQLAlchemyPostRepository implementation

- Add Dishka DI container with providers

- Add error handlers and middleware

Presentation Layer:

- Add FastAPI routes with Dishka integration

- Add Pydantic schemas

- Add dependency injection using FromDishka[T]

Other Changes:

- Remove old flat structure (api/, common/, core/, modules/)

- Add hatchling build system for package scripts

- Add blog CLI command

- Update AGENTS.md with new architecture docs

- All 48 tests passing, mypy clean, ruff clean
2026-05-01 20:20:41 +03:00

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Python

"""SQLAlchemy implementation of Transaction Manager."""
from sqlalchemy.ext.asyncio import AsyncSession
from app.application.interfaces import TransactionManager
class SessionTransactionManager(TransactionManager):
"""SQLAlchemy Session-based Transaction Manager."""
def __init__(self, session: AsyncSession) -> None:
self._session = session
self._committed: bool = False
async def commit(self) -> None:
"""Commit the current transaction."""
if not self._committed:
await self._session.commit()
self._committed = True
async def rollback(self) -> None:
"""Rollback the current transaction."""
if not self._committed:
await self._session.rollback()